The 2021 Pokémon TCG Sword & Shield Expansion Pack S6K Jet-Black Spirit Booster Box is part of the Japanese Pokémon set that is the follow up to Matchless Fighters. Much like Matchless Fighters, Jet-Black Spirit is part of a dual set with Silver Lance making up the other half of the set. The Jet-Black Spirit Japanese set features more Single Strike and Rapid Strike Pokémon cards and introduces Shadow Rider Calyrex V/VMAX to the Pokémon TCG.

Each 2021 Pokémon TCG Sword & Shield Expansion Pack S6K Jet-Black Spirit Booster Box comes packed with five cards per pack and 30 packs per box. The Japanese language Pokémon set released on April 23, 2021